一种基于基带变标的非均匀扫描TOPSAR成像算法

发布时间：2018-05-27 02:29

本文选题：TOPSAR + 非均匀扫描　；参考：《电视技术》2015年21期

【摘要】：由于传统TOPSAR具有均匀的天线扫描速度,在扫描范围较大的情况下,靠近图像边缘的目标被天线波束照射的时间较短,图像中心部分的目标照射时间较长,从而导致了TOPSAR图像分辨率不一致,针对上述问题提出一种非匀速扫描的TOPSAR成像方法,根据TOPSAR扫描几何模型得到图像分辨率与扫描速度的数学关系,通过控制天线的旋转角速度,使场景中方位向不同位置的点目标积累时间相同,从而保证了所得SAR图像具有相同的方位分辨率。仿真结果和分析表明,该方法有效地保证了TOPSAR图像分辨率的一致性。
[Abstract]:Because the traditional TOPSAR has uniform antenna scanning speed, when the scanning range is large, the target near the edge of the image is illuminated by the antenna beam for a shorter time, and the target in the center part of the image has a longer exposure time. Therefore, the resolution of TOPSAR image is inconsistent. In view of the above problems, a non-uniform scanning TOPSAR imaging method is proposed. According to the TOPSAR scanning geometry model, the mathematical relationship between the image resolution and the scanning speed is obtained, and the rotation angular velocity of the antenna is controlled. The accumulation time of points and targets in different azimuth positions in the scene is the same, thus ensuring the same azimuth resolution of the obtained SAR images. Simulation results and analysis show that this method can effectively guarantee the consistency of TOPSAR image resolution.
【作者单位】：桂林电子科技大学信息科技学院;
【基金】：航空基金项目(201101811004)
【分类号】：TN957.52

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